A survey of Iowa hospitals has shown substantial savings that are being credited mainly to the state’s expanded Medicaid program, findings that are mirrored by Quad-City hospitals.

The Iowa Hospital Association surveyed 101 hospitals across the state from January through June of this year and made comparisons with the number of patients seeking care who had or did not have health insurance coverage.

The study shows that of 159,000 hospital discharges during the January-June period, 4,445 patients were uninsured. That compares with 8,181 during the same period of 2013.

That’s a decrease of 45.7 percent across Iowa. At Trinity Bettendorf, the rate is more like 50 percent, Greg Pagliuzza, the chief financial officer for UnityPoint Health Trinity, said Wednesday.

The reductions in Iowa are due to Medicaid expansion through the Iowa Health and Wellness Plan, which resulted from passage of the Affordable Care Act, commonly called Obamacare.